Examining KC Royals newest player Will Smith's pitching arsenal

Most valuable pitch: Slider

Without a doubt, Smith's slider has kept him a successful reliever in the league over the past few seasons. It was his worst pitch back in 2012, with a -2.03 runs above average per 100 pitches, but he has improved it tremendously since then. His slider was one of the league's best, according to Baseball Savant.

Smith's slider registered a 17-run value, tied for second among all MLB pitchers. The pitch only had a 3.9 run value per 100 pitches, ranking 12th in the league. The high quality maintained across Smith's 432 sliders thrown in 2023 is impressive.

His slider's average speed of 81.1 MPH is well below the league's average slider speed of 83.6 MPH. However, he more than makes up for that with above-average horizontal and vertical break. His 7.1 inches of horizontal movement is 1.4 inches higher than the league average, while his 41 inches of vertical movement is 3.3 inches better too. His late-breaking movement baffles opposing hitters. He allowed only a .120 batting average and .213 slugging with his slider.

While Smith does not start a plate appearance with his slider very often, it is a nail in the coffin once he has a lead. He throws that pitch the most after a 0-1 count, allowing only a. 506 OPS to opposing batters once he has the lead.

It is a repeatable pitch that made Smith a reliable reliever last season. Even when he had rough seasons, the slider was Smith's bread and butter. It is a far from perfect pitch, as his slider's active spin rate ranked 394th. It could be far more efficient, but plenty of other star pitchers have found success with similar sliders.

Least valuable pitch: curveball

Smith is primarily an offspeed-centric pitcher at this time of his career, but it is not because of his curveball. A pitch's effectiveness can vary over a career due to many different factors. But Smith's curveball has either been just okay or downright bad across his 11 seasons.

He only threw the pitch 70 times in 2023, but its usage has steadily decreased since the 2021 season. In that three-season span, Smith's curveball has a -5 run value and never had an expected batting average (xBA) lower than .300. Opposing batters jumped all over the pitch once again in 2023, with an 85.7% hard hit rate against it. Inversely, batters whiffed on the pitch 47.4% of the time, fueling the pitch as a boom-or-bust offering from Smith.

The active spin is not very effective; the pitch has a below-average break horizontally and is only marginally better at breaking vertically. All that, coupled with his below-average velocity on the pitch, just makes for a terrible option. Relievers can get by on two pitches for the most part, as Smith does with his fastball and curveball.

The Royals coaching staff has a decision to make regarding Smith's curveball. Do they try to rework his delivery and approach to improve the pitch, or focus time and effort elsewhere? Smith's best seasons, according to fWAR, coincide with two years of an above-average curveball. It is a call that Smith and the coaching staff need to make together, as there has to be a reason he is moving away from the pitch other than its performance.

The Royals adding Smith is hard to be mad about.

Texas Rangers fans decried Smith's performance for them in 2023, citing his nine meltdown performances for the team. But they willfully ignored his 27 shutdown performances, and shoddy defense behid him, which contributed to a massive difference in his 4.40 ERA and 3.36 fielding independent pitching.

Smith is not a strikeout savant on the mound, but his ability to limit hard contact and stay head in the count cannot be ignored. Saves are an overrated stat, but his 113 career saves are miles ahead of any other Royals pitcher on the roster.

I am inclined to believe that Smith will be a prime trade candidate come the 2024 deadline. He is noticeably better in the season's opening half, across his career and 2023 in particular. Kansas City will give Smith and other bullpen arms plenty of opportunities, depending on further rotation additions. Manager Matt Quatraro's opener and bulk pitcher tactics may skew the numbers a bit, but the Royals still used relievers for 623 1/3 innings last year. That ranked 10th in all of the MLB and 5th in the AL.

Combine one year of control, a premiere bullpen role, and Smith's recent production, and I am excited that the Royals added him. Smith is an immediate upgrade over most of the bullpen arms and brings a winning player to the roster. He can help this young team on and off the field. Hopefully, fans will see Smith in a new light after his second tenure in Kansas City.